Blacklist

A Blacklist is a list of IP addresses that have been detected sending unsolicited and unwanted emails. Inbox service providers (like Gmail, Microsoft, Yahoo, and AOL) and enterprises use blacklists to identify and filter illegitimate mail streams. Blacklisting can also occur for specific sending domains in addition to sending IPs.

All major ISPs use some form of blacklisting service to protect their customers from malicious emails, although the deliverability impact can vary depending on the blacklisting service that lists the IP. If you find that your IP address is on the blacklist of one the many legitimate services, then submit a delisting request.

SendGrid keeps a close eye on our IP’s, and we try as quickly as possible to resolve any issues with blacklists. However, getting your IP off the blacklist often requires the user sending the mail to contact the ISP.

Delisting Shared IP Plans

When on a Free or Essentials plan, your account is using shared IP pools - you are sharing IP addresses with many other customers, and there is the potential of being adversely affected by senders in the same pool. When one of the shared IP pools gets blacklisted, SendGrid receives an automatic notification and handles the delisting request on behalf of our customers. Removal time varies depending on the blacklist.

SendGrid is unable to move your account to a new IP pool. The best way to not be impacted by other senders is to get a dedicated IP on a Pro or higher plan.

Delisting Dedicated IP Plans

We ask that our dedicated IP plan users make the initial delisting request if they discover their SendGrid IP on a blacklist. SendGrid is happy to step in and assist with these delisting requests if the listing service requires the IP administrator to take action, or if the delisting form is too complicated.

If a sending domain (and not the IP address) is blacklisted, that domain’s controller is responsible for handling the delisting request.

Checking Your IP Address

Here are 2 aggregation websites that anyone can use to check on the status of their IP:

Delisting Request Forms

Below are links to the delisting forms used by the more popular external blacklisting services:

Gmail, Yahoo, Hotmail, and AOL Bulk Email Sender Guidelines

If you are sending mail using these guidelines and still have problems to deliver email to those email providers, you can contact the ISP support by the following URL:

If a listing service ever asks you pay a fee for a delisting request, or if they say that they do not accept delisting requests, then you should not waste your time or money trying to get your domain/IP delisted because these services are rarely, if ever, used by ISPs.

Looking for customized expert advice to improve your email program? Our team of email experts can help you create a plan to ensure you're optimizing your email delivery and engagement, and avoiding future issues like blacklists. Learn more on our Expert Services page.

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